Missing deferred package in Emacs 24.4

[trishume]

After updating my spacemacs to b50bda33ea2506acc374159c0df7e6cc7090a9ddh today, after the first launch it went through an orphan package deletion cycle where it says it deleted 11 packages, which it didn't list. I don't think there should have been that many orphaned packages, it might have been a bit overzealous.

Now on startup I get a warnings buffer opening up with the following error (yes it is repeated 3 times):

Warning (emacs): Unable to activate package `concurrent'.
Required package `deferred-0.3.1' is unavailable
Warning (emacs): Unable to activate package `concurrent'.
Required package `deferred-0.3.1' is unavailable
Warning (emacs): Unable to activate package `concurrent'.
Required package `deferred-0.3.1' is unavailable

I suspect the orphan deleter might have deleted the deferred package even though concurrent depends on it.

[trishume]

Adding deferred to the packages list of my contrib layer fixes the problem, but I think there might be some deeper underlying problem here.

[syl20bnr]

@trishume Is this related to your layer ?

[syl20bnr]

Oh ok it is related to your config, I'll see if I can reproduce it.

[trishume]

I don't have any evidence that it is related to my layers or configs. I just added it to my layer's package list because it's mine, I could have added it to the main one and that would have solved it as well.

Do you know which package depends on concurrent?

[syl20bnr]

Just tried your layer and it is ok for me, I think you had not fetched this commit 7c3a2f3 yet.

[syl20bnr]

Sorry I was just checking quickly, and you wrote that you pulled the last changes from upstream.
Next time this bug occurs you can see the list of deleted packages in the Message buffer. It will be a good pointer to be able to reproduce it.

[syl20bnr]

@trishume Try to remember the packages that you have tested in the last couple of days and that you have removed from your packages. The key to the repro step is in one of them which is very valuable to me :-)

[syl20bnr]

Packages dependencies:

Packages which depend on deferred:

• concurrent
• python-environment

Packages which depend on concurrent:

• epc

To get the list, in scratch buffer:

(message "%s" (contribsys/load-package-dependencies))

[punassuming]

Now that I have been disabling packages in ~/.spacemacs, I had this issue as well. Both deferred and pkg-info were wiped out but were still needed as dependencies for the remaining packages. I just did a package-install to get them back, and haven't had them wiped again.

[syl20bnr]

@Ralesi Can you write the list of packages you disabled ? I hope to identify which packages cause the bug.

[trishume]

The only package I have disabled is jedi.

[punassuming]

I disabled many. I will get the lost when I get home, but jedi was among the packages

[syl20bnr]

I'll try to use the force to kick this bug then :-)

[syl20bnr]

@trishume @Ralesi Fixed in develop (89a8873)